#!/usr/bin/env bash
#
# hash-sign.sh : hash and sign the following file types
#                in the current dir: .tar.gz, .tar.bz2, .dmg, .zip
#                and .exe
#
user=
FORCE=
SIGN="yes"
while true; do
  case "$1" in
    "-u" ) shift; user="$1"; shift ;;
    "-f" ) shift; FORCE="yes" ;;
    "-n" ) shift; SIGN= ;;
    "--" ) shift; break ;;
    "" ) break ;;
    * ) break ;;
  esac
done

if [ -z "$@" ]; then
  allfiles=`find . -type f \( -name '*.tar.gz' -or -name '*.tar.bz2' -or -name '*.dmg' -or -name '*.zip' -or -name '*.exe' \) -print`
else
  allfiles="$@"
fi

echo ""
echo "Generating SHA256/SHA512 checksum files ..."
echo ""

# check for executables
gpg2="`which gpg2 2> /dev/null | head -1`"
gpg="`which gpg 2> /dev/null | head -1`"
pgp="`which pgp 2> /dev/null | head -1`"
sha512sum="`which sha512sum 2> /dev/null | head -1`"
sha256sum="`which sha256sum 2> /dev/null | head -1`"
sha512="`which sha512 2> /dev/null | head -1`"
sha256="`which sha256 2> /dev/null | head -1`"
openssl="`which openssl 2> /dev/null | head -1`"
sed="`which gsed 2> /dev/null | head -1`"
if ! [ -x "${sed}" ]; then
  sed="`which sed 2> /dev/null | head -1`"
fi;

# if found we use openssl for generating the checksums
# and convert the results into machine-readable format.
if [ -x "${openssl}" ]; then
  for file in ${allfiles}; do
    if [ -f "${file}" ]; then
      if [ ! -f "${file}.sha512" -o "${FORCE}" = "yes" ]; then
        echo "openssl: creating sha512 checksum file for ${file} ..."
        ${openssl} sha512 ${file} |\
            ${sed} -e 's#^SHA2*-*512(\(.*/\)*\(.*\))= \([0-9a-f]*\)$#\3 *\2#' > ${file}.sha512
      fi
      if [ ! -f "${file}.sha256" -o "${FORCE}" = "yes" ]; then
        echo "openssl: creating sha256 checksum file for ${file} ..."
        ${openssl} sha256 ${file} |\
            ${sed} -e 's#^SHA2*-*256(\(.*/\)*\(.*\))= \([0-9a-f]*\)$#\3 *\2#' > ${file}.sha256
      fi
    fi
  done
# no openssl found - check if we have gpg2
elif [ -x "${gpg2}" ]; then
  for file in ${allfiles}; do
    if [ -f "${file}" ]; then
      if [ ! -f "${file}.sha512" -o "${FORCE}" = "yes" ]; then
        echo "gpg2: creating sha512 checksum file for ${file} ..."
        ${gpg2} --print-md sha512 ${file} |\
            ${sed} -e '{N;s#\n##;}' |\
            ${sed} -e 's#\(.*/\)*\(.*\): \(.*\)#\3::\2#;s#[\r\n]##g;s# ##g' \
                -e 'y#ABCDEF#abcdef#;s#::# *#' > ${file}.sha512
      fi
      if [ ! -f "${file}.sha256" -o "${FORCE}" = "yes" ]; then
        echo "gpg2: creating sha256 checksum file for ${file} ..."
        ${gpg2} --print-md sha256 ${file} |\
            ${sed} -e '{N;s#\n##;}' |\
            ${sed} -e 's#\(.*/\)*\(.*\): \(.*\)#\3::\2#;s#[\r\n]##g;s# ##g' \
                -e 'y#ABCDEF#abcdef#;s#::# *#' > ${file}.sha256
      fi
    fi
  done
# no gpg2 found - check if we have gpg
elif [ -x "${gpg}" ]; then
  for file in ${allfiles}; do
    if [ -f "${file}" ]; then
      if [ !-f "${file}.sha512" -o "${FORCE}" = "yes" ]; then
        echo "gpg: creating sha512 checksum file for ${file} ..."
        ${gpg} --print-md sha512 ${file} |\
            ${sed} -e '{N;s#\n##;}' |\
            ${sed} -e 's#\(.*/\)*\(.*\): \(.*\)#\3::\2#;s#[\r\n]##g;s# ##g' \
                -e 'y#ABCDEF#abcdef#;s#::# *#' > ${file}.sha512
      fi
      if [ ! -f "${file}.sha256" -o "${FORCE}" = "yes" ]; then
        echo "gpg: creating sha256 checksum file for ${file} ..."
        ${gpg} --print-md sha256 ${file} |\
            ${sed} -e '{N;s#\n##;}' |\
            ${sed} -e 's#\(.*/\)*\(.*\): \(.*\)#\3::\2#;s#[\r\n]##g;s# ##g' \
                -e 'y#ABCDEF#abcdef#;s#::# *#' > ${file}.sha256
      fi
    fi
  done
else
  # no openssl or gpg found - check for sha512sum
  if [ -x "${sha512sum}" ]; then
    for file in ${allfiles}; do
      if [ -f "${file}" ]; then
        echo "sha512sum: creating sha512 checksum file for ${file} ..."
        ${sha512sum} -b ${file} > ${file}.sha512
      fi
    done
  # no openssl or gpg found - check for sha512
  elif [ -x "${sha512}" ]; then
    for file in ${allfiles}; do
      if [ -f "${file}" ]; then
        echo "sha512: creating sha512 checksum file for ${file} ..."
        ${sha512} -r ${file} | ${sed} -e 's# # *#' > ${file}.sha512
      fi
    done
  fi
  if [ -x "${sha256sum}" ]; then
    for file in ${allfiles}; do
      if [ -f "${file}" ]; then
        echo "sha256sum: creating sha256 checksum file for ${file} ..."
        ${sha256sum} -b ${file} > ${file}.sha256
      fi
    done
  elif [ -x "${sha256}" ]; then
    for file in ${allfiles}; do
      if [ -f "${file}" ]; then
        echo "sha256: creating sha256 checksum file for ${file} ..."
        ${sha256} -r ${file} | ${sed} -e 's# # *#' > ${file}.sha256
      fi
    done
  fi

fi

echo ""
if [ "${SIGN}" = "yes" ]; then
    echo "Signing the files ..."
    echo ""

    # We have gpg2
    if [ -x "${gpg2}" ]; then
      if [ -n "${user}" ]; then
        args="-u ${user} ${args}"
      fi
      for file in ${allfiles}; do
        if [ -f "${file}" ]; then
          echo "gpg2: creating asc signature file for ${file} ..."
          ${gpg2} --yes --armor ${args} --detach-sign ${file}
        fi
      done
    # no gpg2 found - check for gpg
    elif [ -x "${gpg}" ]; then
      if [ -n "${user}" ]; then
        args="-u ${user} ${args}"
      fi
      for file in ${allfiles}; do
        if [ -f "${file}" ]; then
          echo "gpg: creating asc signature file for ${file} ..."
          ${gpg} --yes --armor ${args} --detach-sign ${file}
        fi
      done
    # ... no GnuPG? Try PGP
    elif [ -x "${pgp}" ]; then
      if [ -n "${user}" ]; then
        args="-u ${user}"
      fi
      for file in ${allfiles}; do
        if [ -f "${file}" ]; then
          echo "pgp: creating asc signature file for ${file} ..."
          ${pgp} -sba ${file} ${args}
        fi
      done
    else
      echo "PGP or GnuPG not found!  Not signing release!"
    fi
fi